Supporting means for drawing boards



Aug. 31, 1943. K. GACK SUPPORTING MEANS FOR DRAWING BOARDUS'V Original Filed March 19, 1938 ,Z'nvenior. (14/21. GA ch ulf-lorney.

j lhejiiventionalso has it 1 every positionandflwill'thereioreh in'ovewhille j drawing is :p eedin krdr .draw'i'ng rs greatly the drawingfbo'ard moves sud-, denlyfin an unexpected manner-1; I *This is efiected according to, the invention through the parts of the joint [of 'the drawsecured, with respect to 7 one another against lateral turning and through i the pin 01 the joint being arrangedso as to be i capable o ffsliding lander being flxedonfthe. drawingboard; In a preferredarran'genientany n 'turning'oi the parts ofithe jointjisprevented byi t a clamping screw which is arranged perpeh'dicu larly to the connectingdine'of the two screws connecting the parts ,of the joint and which bears'against the shank ofoneof the; we conf fnecti'ng screws and abyythis meansupressesboth i connecting screws against the wallof'the'ir bores in thegmlddle piece, Forslidably supporting the n jointpin'on the drawing boarda plate-is'proing board holder being vided which by meansof four, bolts is capable of'sliding on and being flxedv to guides formed by rails; -I n placeoffthe rails for.fixing and sliding thedrawing board holder on the drawing board a; supporting plate,-fori'instance of sheet; metal, maybe used, which; is provided 1: with one or more guiding slots and hasjdepressions which constitute: a reinforcement-and. are preferably arranged. on eitherfsiderof the guiding slots; v I '1 Ajdrawing board holderconstructedr accordv.ing to the invention enablesfthe drawing board" tobe swung in a simple manner intodifl'erefnt planes, whereby drawinglis greatly facilitated. It {alsofensures unobstructed working onthej draw ingboard; Any tuming oi theparts 'oilthe joint I with respectito one another is'prevented by the pressure action of the clamping screwzwhichcis; disposed perpendicularly: to the shank of onev screw; This eliminates'theplay oftthe screw bolts in theirbores', which playis practicallyuna'void n able in the manufacture. Furthermore; through the slidable mountingloi the'joint pin: anythe A l drawing board the rnobility'of the latter is greatlyincreased Throughsliding and swinging the] Q In ,lth rno rdn Th eiemployme 151.55 w ii Ie-mstructionaI part1 simile rand: heap, to unman; be; wdr i po 'ruapidly a a pot the joint Fig. 2fisa bottom plan View of the device, I-

'the parts offthe Jointly q the drawingfboard A thedrawing boardholder to ,be capable of turning me sphericalsocket part-or plate h of, the jointgwhich hasa corresponding spherical hol'e, in the positionoi' use ibetween the upper, part ,1; of th e Q gmiddle'piece gfon theball ffl With the lever q in the, position drawing. board to swing the two "bolt" nuts kQk' by thegscrew o'screwing outtof its thread or its 55 drawing boardwithirespect to-thejointpin azrlnotion"nitric-drawingaboard theidirectionwfrdni to gbotiiorn'orfyice' yersamambo-"obtained, naiinost w twievtherhemht V nitst a netism i i er'red' ovaboveislofparticmar advantagerirmhis plate is; yeryfjrigid zkandzunyielding."ciiA-ifit -ton- V V lir'awifis i e; a

V Fig. 3 is a sectionon'line A-Bpf Fig. 2 through v Fig. 4 isa section on line C--D ofFig. 2: n I The drawing'board holder is fixed to the work- W p ing table 'by'rneans of a screw clamp B. Tor,

isflxed by means oj thevpin a which carries the Q ball for the joint. The ball fis disposed so as i provided in' the middle part g formed by the clamp B. L The ball fis clain'ped'by the ,upper by corresponding pressure against the middle, part or plate g. For connecting the upper part, hot the Joint, the middle part gV-a'nd the bottom, plate I with one another the two boltsi and i are h i K provided which extend through the bores s, a; n the guide slots!) 1? and the boresu, u of the" The boltsfi, i" are'provided with nuts 1 slightly conicaland isliguided in a countersunk v 1 it berets of the niddle piece {g. The headcf the fsc'rew is connected-to jaql'everwq which bringsgg laboutlandfreleases the clamping effect exerted-*1 Jointand the si I 7 which allowjs f t H the ball to turn unhindered and consequently the i are tightened. On the lever o 'beingnswung in the directionio'r. unscrewingthe screw 0, p, the n middleypi ece'g and the 'platell are forced apar't' headp; rThis results' in a "corresponding tighte ""ening of "the upper part it of the joint against the-middle piece 9 and a clamping 10f the'ball v 1 1" between'the parts h and 'g; For releasing the clamping action the lever q is swung in'the opposite direction. b a I For compensating the play-92121 vGPnnecting bolts i, 'i" in their bores s, 8', air" orintheir slots t,"" t," which cannot befeliniinatedin the manufacture of the parts, vsci as to prevent any;,

turning o'fthe partsof'the- 'Oint with respect to v one another,' a clamping screw mi, is provided which bears against the shank of one of the two ;connecting bolts, for instance the bolt 2', and

I r presses the 'latterat the point *I tightly-against "the Wall of the slot t. This causes the-"shank V of thebolt i. to be pressed at the point 11 firmlyagainst the-wall of the slot ti. iPreferably' 'the" 1 middle piece g is provided in:the-region of the screw mwith a suitable thickening n.

t The'joint pin a is 'fixedto the plate b ane c latter is provided with two, or more, preferably v four; bfolts dlwhich extend through the guide 1 fslot's formedby the Trails c. By rneans of 'the .nuts d!whichare'preferablyin the form of wing "i:nuts',' the plate bf and withriti -the twhole drim ing" board holder may be'fixedin any desiredfp'o'sition on thel rails' c: Thegrailsjc are arranged' 'at Ia {certain gdistance from thee-drawing board A, for

' which purpose-the transverse rails e are placed J under them; so that the screw bolts (2' which may cle arance during the *slidingfrnotion.

,HaVingI'iow particularlydescribedan ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is:

1. A'device' forisupporting and adjusting a '5 drawing board or the like comprising a pin sej c'ured 'at-one end to the board iandhaving a ball at the otherendj, an uppenplata' a'fmiddle Plate,

"anda bottom plate, theupper and middle plates '"fto limit the distance between the upper and bottom plates,"an'd means operatively connected to to the'middle'plate: to iforcef the middle plate 15 against (the position; 1 I 2."A';deviceflfor supporting and adjusting a cured at 0116161111 tothe boardand, havinga ball 'at the other end, an upper plate, a middle plate,

fo limi't the dist-an between;thefl l rfa being in contactwith and adjacent to the ball, "means to maintain the plates in alignment and J thebottom plate'including a screw clamp secured upper" plate to clamp the board in drawing board. or the like comprising a pin-se-' anda bottom plate, the upper and middle plates fbei'n'g in pon'ta'etwitlfand' adjacentto tl ieflisall, l ,tme'ans td inaintain -the plates'iiralignmeiitand 1 5 plates; {ammeens eperatively eonne'cted t'o the teammat ,ih'cliidingtalfsbrew havingfa' mead-aria aileyer onnect'ed to ;the "head, said we 7 plate and the head engagin'githe iniqgue platelj'w rebyiibon' rotation .of'th lever'the V 

